1.1 本规范 2. 包括用作工艺管线的电阻焊接低碳钢管。 1.2 根据本规范订购的管道应适用于涉及所有尺寸的翻边和弯曲以接近NPS 4[DN 100]半径的严重成型操作。 1.3 本规范涵盖NPS 1. / 2. [DN 15]至NPS 10[DN 250]，以及其他尺寸。NPS的相应外径和壁厚 1. / 2. [DN 15]至10[DN 250]列在 表1 ，以及其他尺寸的尺寸。 注1: 本标准中，无量纲指示符NPS[DN]（公称管道尺寸）已取代传统术语，如“公称直径”、“尺寸”和“公称尺寸” 1.4 单位- 本规范以英寸-磅单位和国际单位表示；但是，除非采购订单或合同规定了适用的M规格名称（国际单位制），否则英寸- 应采用磅单位。以英寸单位或国际单位表示的数值应单独视为标准值。在文本中，SI单位显示在括号中。每个系统中规定的值可能不完全相等；因此，每个系统应独立于其他系统使用。结合两个系统的值可能会导致不符合标准。 1.5 以下预防性警告仅适用于试验方法部分，章节 7. , 13 和 14 本规范中的: 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This specification 2 covers electric-resistance-welded low-carbon steel pipe intended for use as process lines. 1.2 Pipe ordered under this specification shall be suitable for severe forming operations involving flanging in all sizes and bending to close radii up to and including NPS 4 [DN 100]. 1.3 This specification covers NPS 1 / 2 [DN 15] through NPS 10 [DN 250], plus additional sizes. The corresponding outside diameters and wall thicknesses for NPS 1 / 2 [DN 15] through 10 [DN 250] are listed in Table 1 , as are the dimensions for the additional sizes. Note 1: The dimensionless designator NPS [DN] (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter,” “size,” and “nominal size.” 1.4 Units— This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract specifies the applicable M specification designation (SI units), the inch-pound units shall apply. The values stated in either inchpound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.5 The following precautionary caveat pertains only to the test method portion, Sections 7 , 13 , and 14 , of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.